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[media] s5p-mfc: set allow_zero_bytesused flag for vb2_queue_init 

The s5p-mfc driver interprets a buffer with bytesused equal to 0 as a
special case indicating end-of-stream. After vb2: fix bytesused == 0
handling (8a75ffb) patch videobuf2 modified the value of bytesused if it
was 0. The allow_zero_bytesused flag was added to videobuf2 to keep
backward compatibility.

Signed-off-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Kamil Debski 2015-02-23 09:26:19 -03:00 committed by Mauro Carvalho Chehab
parent e4af23d331
commit e6c9dec3e7
1 changed files with 7 additions and 0 deletions
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7
drivers/media/platform/s5p-mfc/s5p_mfc.c
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@ -843,6 +843,13 @@ static int s5p_mfc_open(struct file *file)
ret = -ENOENT;
goto err_queue_init;
}
/* One way to indicate end-of-stream for MFC is to set the
* bytesused == 0. However by default videobuf2 handles bytesused
* equal to 0 as a special case and changes its value to the size
* of the buffer. Set the allow_zero_bytesused flag so that videobuf2
* will keep the value of bytesused intact.
*/
q->allow_zero_bytesused = 1;
q->mem_ops = &vb2_dma_contig_memops;
q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
ret = vb2_queue_init(q);